Skip to content
Permalink
main
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
Go to file
 
 
Cannot retrieve contributors at this time
"""
Cached, database-backed sessions.
"""
from django.conf import settings
from django.contrib.sessions.backends.db import SessionStore as DBStore
from django.core.cache import caches
KEY_PREFIX = "django.contrib.sessions.cached_db"
class SessionStore(DBStore):
"""
Implement cached, database backed sessions.
"""
cache_key_prefix = KEY_PREFIX
def __init__(self, session_key=None):
self._cache = caches[settings.SESSION_CACHE_ALIAS]
super().__init__(session_key)
@property
def cache_key(self):
return self.cache_key_prefix + self._get_or_create_session_key()
def load(self):
try:
data = self._cache.get(self.cache_key)
except Exception:
# Some backends (e.g. memcache) raise an exception on invalid
# cache keys. If this happens, reset the session. See #17810.
data = None
if data is None:
s = self._get_session_from_db()
if s:
data = self.decode(s.session_data)
self._cache.set(
self.cache_key, data, self.get_expiry_age(expiry=s.expire_date)
)
else:
data = {}
return data
def exists(self, session_key):
return (
session_key
and (self.cache_key_prefix + session_key) in self._cache
or super().exists(session_key)
)
def save(self, must_create=False):
super().save(must_create)
self._cache.set(self.cache_key, self._session, self.get_expiry_age())
def delete(self, session_key=None):
super().delete(session_key)
if session_key is None:
if self.session_key is None:
return
session_key = self.session_key
self._cache.delete(self.cache_key_prefix + session_key)
def flush(self):
"""
Remove the current session data from the database and regenerate the
key.
"""
self.clear()
self.delete(self.session_key)
self._session_key = None